Phytologia 28: 335 (1974).
Basionym: Parmelia diffactaica Essl., Byrologist 75: 80 (1972).
Description: Lichen. Thallus foliose. Upper surface sorediate submarginally; rhizinate to the margin below (Hale & Fletcher 1990: 27).
Algae: Trebouxioid green alga.
Chemistry: Atranorin, diffractaic acid, lichexanthon (in the medulla) (Hale & Fletcher 1990: 27).